PVP at 90: Resto Druid vs Resto Shaman

Hello all I recently came back to wow and I am going to level a healer for pvp. I am currently torn between a resto druid and a resto shaman so I thought I would ask the nice folks on MMO-Champ So what do you guys think? PVP will be my primary focus, and I will OS as ranged dps but that is not a main focus. What are the strengths of each spec? How do they handle in pvp? I am thinking of doing bgs and 3v3 arena mainly. Thanks in advance!